KR100241709B1 - Steering shaft of car - Google Patents

Abstract

The present invention relates to a steering shaft of a motor vehicle, comprising a plurality of H-shaped power transmission members (42-1 to 42-N-1), two Y-shaped power transmission members (44-1), (44-2) and Each of the power transmission members 42-1 to 42-N-1, 44-1, and 44-2 has the Y-shaped power transmission members 44-1 and 44-2 at both ends. ) Is composed of a plurality of cross (+) type joints (46-1 ~ 46-N) for orthogonal coupling to each other, each of the H-shaped power transmission members (42-1 ~ 42-N-1) is coupled to both sides Wings 52 are formed so that the cross-joints 46-1 to 46-N are twisted by a predetermined angle to each other, while the cross-shaped joints 46-1 to 46-N are formed on the wings 52. Each of the holes 54 fitted therein is formed to be deformed during the collision of the vehicle to prevent the steering device from protruding toward the driver and harming the driver, and at the same time to alleviate the impact when the driver contacts the steering device with inertia. It is.

Description

Steering shaft of car

The present invention relates to a steering shaft of a vehicle, and more particularly, when the steering wheel protrudes toward the driver to prevent harm to the driver when the vehicle body is damaged due to the collision of the vehicle, and at the same time the driver inertically contacts the steering apparatus. It relates to a steering shaft of a car for mitigating the impact.

In general, a steering device of a vehicle transmits a steering angle for adjusting a traveling direction of a vehicle to a steering gear to change the steering angle of a steering knuckle, and the steering shaft connects the steering wheel and the steering gear to restrain the rotation in the axial direction. To pass each.

1 is a schematic diagram of a steering apparatus for a vehicle according to a first embodiment, wherein a conventional steering apparatus includes a steering wheel 2, a first steering shaft 4, and a second steering shaft 6. The steering wheel 2 is a circular handle for steering operation and is mounted to the deck cross member, and the first steering shaft 4 and the second steering shaft 6 are configured to control the power of the steering wheel 2. The steering angle is transmitted by transmitting to a steering gearbox (not shown) to constrain axial rotation.

That is, the first steering shaft 4 and the second steering shaft 6 are connected to each other by the first universal joint 8, and by the second universal joint 10 of the second steering shaft 6. Is connected to a steering gearbox to transfer the power of the steering wheel (2) to the steering gearbox.

In the conventional steering operation apparatus as described above, when the engine is pushed to the rear of the vehicle during frontal collision or offset collision of the vehicle, the steering wheel 2 is moved to the rear, and the driver proceeds to the front of the vehicle, There was a problem in that the collision acceleration between the driver and the steering wheel 2 is increased and the injury value of the driver is increased.

In addition, various vibrations generated in the suspension system are transmitted to the steering wheel 2 through the first and second steering shafts 4 and 6, thereby deteriorating the vibration characteristics of the vehicle.

The present invention is to solve the above-mentioned problems of the prior art, it is deformed during the collision of the vehicle to prevent the steering device from protruding toward the driver to harm the driver and at the same time the impact when the driver contacted the steering device inertia It is to provide a steering shaft of the car to alleviate the problem.

In addition, another object of the present invention is to prevent the various vibrations generated in the suspension device to be transmitted to the steering wheel through the steering shaft to improve the vibration characteristics of the vehicle.

Steering shaft of a vehicle according to the present invention for achieving this object, a plurality of crosses (+) for coupling a plurality of H-shaped power transmission member, two Y-shaped power transmission member and each of the power transmission member orthogonal to each other. In the steering shaft of a vehicle made of a type joint, the wings of the H-shaped power transmission member coupled to each of the cross-shaped joints are twisted so that the cross-joints on both sides of the H-shaped power transmission member are twisted by a predetermined angle to each other. Characterized in that formed.

1 is a schematic diagram of a steering control apparatus for a vehicle according to a conventional embodiment.

2 is a schematic view of a steering control apparatus for a vehicle provided with a steering shaft according to the present invention.

3 is a detailed perspective view of the steering shaft shown in FIG.

4 is an exploded perspective view of the steering shaft shown in FIG.

5 is a cross-sectional view taken along line A-A 'of the steering shaft shown in FIG.

6 is a detailed perspective view of the H-shaped power transmission member shown in FIG.

FIG. 7 shows angular changes of cross-shaped joints by the H-shaped power transmission member shown in FIG.

8 is an external view of a vehicle steering control device showing a shape in which a steering shaft of the present invention is deformed after a vehicle collides.

* Explanation of symbols for main parts of the drawings

22: steering wheel 24: first steering shaft

26: 2nd steering shaft 28: 1st universal joint

30: 2nd universal joint 42-1 to 42-N-1: H-shaped power transmission member

44-1, 44-2: Y-shaped power transmission member

46-1 ~ 46-N: Cross joint

50: dust cover 52: wings

54: hole 62: tip

64: cavity 66: compression spring

68: male thread 70: male thread part

72: female thread

2 is a schematic view of a steering control apparatus for a vehicle equipped with a steering shaft according to the present invention, and FIG. 3 is a view of the steering shaft shown in FIG. 2; FIG. 4 is an exploded perspective view of the steering shaft shown in FIG. 3, FIG. 5 is a sectional view taken along line BB 'of the steering shaft shown in FIG. 3, and FIG. 6 is a view of the H-shaped power transmission member shown in FIG. A detailed perspective view, and FIG. 7 is a view showing each change of the cross-shaped joints by the H-shaped power transmission member shown in FIG.

As shown in FIG. 2, a steering control apparatus for a vehicle having a steering shaft according to the present invention includes a steering wheel 22, a first steering shaft 24, and a second steering shaft 26 according to the present invention. The steering wheel 22 is mounted to the deck crossmember as a steering wheel for steering operation, the first steering shaft 24 and the second steering shaft 26 of the steering wheel 22 By transmitting power to a steering gearbox (not shown) to constrain axial rotation, the steering angle is transmitted.

In addition, the first steering shaft 24 according to the present invention includes a plurality of H-shaped power transmission members 42-1 to 42 -N-1 and two Y-shaped power transmission members, as shown in FIG. 3. Each of the power transmission members 42-1 to 42-N-1 with (44-1) and (44-2) and the Y-shaped power transmission members 44-1 and 44-2 as both ends. ), (44-1), and (44-2) are composed of a plurality of cross (+) type joints (46-1 ~ 46-N) that are orthogonal to each other.

And, the dust cover 50 for protecting the steering shaft 24 according to the present invention made as described above from external foreign substances such as dust is provided.

4 to 7, the H-shaped power transmission members 42-1 to 42-N-1, and the Y-shaped power transmission members 44-1 and 44-2, respectively. Each blade 52 is formed with holes 54 fitted in the cross-shaped joints 46-1 to 46-N, respectively.

Each of the H-shaped power transmission members 42-1 to 42 -N-1 has wings 52 to twist the cross joints 46-1 to 46 -N coupled to both sides by a predetermined angle α. Is twisted.

In addition, the cross-shaped joints 46-1 to 46-N have cavity portions 64 respectively formed inside the tip portions 62 protruding in all directions, and embedded in the respective cavity portions 64. A male screw 68 is formed in the compression spring 66 and a portion of the compression spring 66 that is embedded in the cavity 64 and protrudes to the outside by elasticity of the compression spring 66. It is configured to include a male screw portion 70 and a female screw 72 screwed with the male screw 68 formed in the male screw portion 70.

Referring to the operation of the steering shaft of the vehicle according to the invention of the above structure in detail as follows.

When the driver rotates the steering wheel 22 to transmit power to the steering shaft 24 to adjust the steering angle, the force is transmitted to the second steering shaft 26 as it is.

That is, the first steering shaft 24 includes a plurality of H-shaped power transmission members 42-1 to 42 -N-1, two Y-shaped power transmission members 44-1, 44-2, and A plurality of cross (+) type joints (46-1 to 46-N) for coupling the power transmission members (42-1 to 42-N-1), (44-1), and (44-2) orthogonal to each other. The first Y-shaped power transmission member 44-1 is connected to the second steering shaft 26, the second Y-shaped power transmission member 44-2 is connected to the steering wheel 22 Therefore, the power of the steering wheel 22 can be transmitted to the second steering shaft 26.

In addition, when a force is transmitted to the first steering shaft 24 in the horizontal direction, the first steering shaft 24 is transmitted to the first steering shaft 24 without rotational displacement of the first steering shaft 24. When the force is not vertical, rotational displacement occurs, and the angle between both ends of the first steering shaft 24 is not 180 degrees, so that the Y-shaped power transmission member 44-1, 44- in case of a vehicle collision. The force applied to 2) is not horizontal to the steering shaft 24.

Therefore, when a force is applied to the rear of the vehicle through the steering gearbox and the second steering shaft 26, the first steering shaft 24 is bent to absorb shock as shown in FIG.

In other words, when the H-shaped power transmission members 42-1 to 42-N-1 rotate in the upward or downward direction, the steering shaft 24 is bent.

At this time, the angle of the cross-joint adjacent to each other as shown in Figs. 6 to 7 with respect to the steering axis 24 direction, the H-shaped power transmission members (42-1 ~ 42-N-1) are both sides Since the wing 52 is twisted so that the cross joints 46-1 to 46-N coupled to each other are twisted by a predetermined angle α, the shock absorbing becomes better when the impact force is transmitted.

More preferably, if the angular change of the cross-joints 46-1 and 46-N located at both ends of the first steering shaft 24 according to the present invention is about 90 degrees, the shock absorption may be smoother. will be.

In addition, there is a certain amount of play in the contact surface between the cross joints 46-1 to 46-N and the power transmission members 42-1 to 42-N-1, 44-1, and 44-2. The steering shaft 24 has such a cross-joint and a plurality of power transmission members, so that the driver has no play that does not affect the steering of the car by operating the steering wheel 22.

As the steering shaft 24 has a certain amount of play as described above, vibrations such as Shimmy and Judder, which are introduced through the steering gear box and the second steering shaft 26, are absorbed and the steering wheel ( The vibration characteristic of 2) can be improved.

As described above, according to the present invention, the vehicle is deformed during the collision of the vehicle to prevent the steering apparatus from protruding toward the driver and harming the driver, and at the same time, it is possible to alleviate the shock when the driver contacts the steering apparatus with inertia. .

In addition, it is possible to improve the vibration characteristics of the vehicle by preventing the various vibrations generated in the suspension device to be transmitted to the steering wheel through the steering shaft.

Claims (2)

In the steering shaft of an automobile comprising a plurality of H-shaped power transmission members, two Y-shaped power transmission members, and a plurality of cross-shaped (+) joints for coupling the power transmission members at right angles to each other, The wing shaft of the H-shaped power transmission member coupled to the +)-type joint, wherein the wing is formed so that the cross-shaped joints on both sides of the H-shaped power transmission member are twisted by a predetermined angle to each other. The angle of twist of the wing of the H-shaped power transmission member is set so that the cross-shaped joints located at both ends of the H-shaped power transmission member and the cross-shaped joint are twisted approximately 90 degrees with each other. Steering axis of the car.